Series 12 Episode 17
Penny and Bernadette go to San Diego for a pharmaceutical sales convention, leaving Howard in charge of the children. Then Sheldon finds a book containing science experiments to carry out with kids...
Series 12 Episode 1
The Conjugal Configuration: Sheldon and Amy's honeymoon runs aground in New York. Raj starts a social media dispute.
Series 12 Episode 1
Series 12 Episode 2
The Wedding Gift Wormhole: Sheldon and Amy try to figure out the function of a wedding gift from Leonard and Penny
Series 12 Episode 2
Series 12 Episode 3
The Procreation Calculation: Howard and Bernadette's life gets complicated when Stuart brings his new girlfriend home
Series 12 Episode 3
Series 12 Episode 4
The Tam Turbulence: Leonard tries to find out why Sheldon has never mentioned Tam, his childhood best friend
Series 12 Episode 4
Series 12 Episode 5
The Planetarium Collision: Sheldon sabotages Amy's career. Howard is asked to co-host Raj's show at the planetarium.
Series 12 Episode 5
Series 12 Episode 6
The Imitation Perturbation: Howard dresses up as Sheldon for Halloween, but Sheldon gets his own back later at a party
Series 12 Episode 6
Series 12 Episode 7
The Grant Allocation Derivation: Leonard faces tough choices when he is made responsible for distributing extra grant money
Series 12 Episode 7
Series 12 Episode 8
The Consummation Deviation: Sheldon attempts to befriend Amy's father, but ends up having to bond with her mother
Series 12 Episode 8
Series 12 Episode 9
The Citation Negation: Bernadette asks Stuart's girlfriend Denise to teach her how to beat Howard at a video game
Series 12 Episode 9
Series 12 Episode 10
The VCR Illumination: A VHS tape from Sheldon's past inspires him not to give up on his latest scientific theory
Series 12 Episode 10
Series 12 Episode 11
The Paintball Scattering: Raj spots Anu talking to her ex-boyfriend. Penny and Leonard organise a paintball game.
Series 12 Episode 11
Series 12 Episode 12
The Propagation Proposition: Penny's ex Zack and his wife ask Leonard for a favour. Raj tries to make up with Anu.
Series 12 Episode 12
Series 12 Episode 13
The Confirmation Polarization: Sheldon and Amy's super-asymmetry theory is proved correct by two physicists from Chicago
Series 12 Episode 13
Series 12 Episode 14
The Meteorite Manifestation: Sheldon is thrilled to help Howard and Bernadette navigate some bureaucratic paperwork
Series 12 Episode 14
Series 12 Episode 15
The Donation Oscillation: Penny attempts to sabotage Leonard's efforts to help Zack and Marissa have a family
Series 12 Episode 15
Series 12 Episode 16
The D & D Vortex: The gang find out Wil Wheaton's hosting a celebrity game of Dungeons & Dragons at his home
Series 12 Episode 16
Series 12 Episode 17
The Conference Valuation: Penny and Bernadette go away to a sales convention, leaving Howard in charge of the kids
Series 12 Episode 17
Series 12 Episode 18
The Laureate Accumulation: Sheldon and Amy ask some Nobel laureates to take their side against academic competitors
Series 12 Episode 18
Series 12 Episode 19
The Inspiration Deprivation: Amy has a meltdown when she feels pressure over the possibility of winning a Nobel Prize
Series 12 Episode 19
Series 12 Episode 20
The Decision Reverberation: Raj feels worried after publishing a paper that suggests he may have discovered alien life
Series 12 Episode 20